Cooling element



F. LJUNGSTRM. COOLING ELEMENT. APPLICATION msn 1m28. 1920.

'Patented Dech 27, 1.921.

` ing UNITEDs'rArEs PATENT OFFICE.

rnmmrx LJUNGs'rnm, or nnnvrx, LIDINGN, SWEDEN, `Assianon. 'ro Ax'rm- BoLAGE'r LJUNGs'rnxs ANGTUBBIN, or srocxnomr, SWEDEN, A couronn- TION. l

Speoication o! Letters Patent.

COOLING ELEMENT.

y Patented Dec. 27, 1921.

Application tiled January 28, 1920. i Serialllo. 354,759.

den, residing at Brevik, Lidingn, Sweden,-

have invented certain new `and useful Improvements in Cooling Elements (for which I have filed application in Sweden Jan. 21, 1919, D. N O 21H/19,) of which the followingis a Specification.

he present invention relates to an arrangement in cooling elements disposed beside each other, and the invention hasfor its' purpose to provide .for as large a cooling surface as possible within a .limited space.

The invention consists inthe elements bethe outside with projecting ribs. The invention also consists 'in the fact that the ribs of the opposite faces of two adjacent cooling elements are disposed so as to cross each other, the ribs on the opposite sides of each element being also arranged to cross each other, if desired.4

In the accompanying drawing, an embodimenty of the invention is shown by way of example. Figure 1 is a partial sectional elevation of an arrangement according to the present invention, and Fig. 2 is a cross section on line A-B of Fig. 1. Fig. 3 is an enlarged sectional View, taken on lines C--D of Fig. 1, of part of an element according to the invention.

In Figs. 1 and 2, 1 denotes the elements which are inserted groupwise into the square p`i e or chamber 2. The elements are provi led with projectin ribs 3 so as to produce a larger cooling sur ace. Fig. 3 shows an formed of flattened pipes provided on element drawn to a larger scale, both sides of the flattened pipe being provided with dents 4 touchin each other on the inside so as to prevent t e sides from being squeezed togethier, shouldthere be a vacuum in the elemen n element with these projecting ribs or f cams is extremely eicient, particularly when steam or water within the elements is being cooled by means of air circulating -around the elements. Besides producing a larger cooling surface, the ribs bring about a whirling rountl of the air so that each particle of air 1s brought in contact with the element.

Obviously, the invention may be equally well applied to heating elements.

What I claim as new and desire to secure by Letters Patent of the United States is 1. A. j lurality of cooling elements arranged slde by side and each consisting of a flattened pipe, and flat laterally projecting solid ribs provided on the outside of the pipe,

extending obliquely from one edge to the other edge of the pipe and the ribs of the opposite walls of two adjacent cooling elements being arranged so that they cross each other.

2. An arrangement as set forth in claim 1 wherein the ribs on the opposed side of each cooling element cross each other.

ln testimony whereof I affix my signature in presence of two witnesses.

FREDRIK LJUNGsTRM.

Witnesses P. I-I. BnRGRorH, OSCAR GRALEN. 

